新型悬浮填料澄清池中填料对澄清作用的影响初探

Influence of media on clarity of novel suspended media clarifier

为考察可取代传统二沉池的新型悬浮填料澄清池技术的原理及关键参数,小试试验研究了填料对新型悬浮填料澄清池固液分离过程中附着污泥形成及其絮凝性能的影响,并对填料在澄清中的作用机理进行了探讨。结果表明,当泥水界面上升至填料区后,可以形成较悬浮污泥更加致密稳定的附着污泥区,并形成孔道流,强化了对混合液中污泥颗粒的絮凝效果;填料区可以捕捉去除从悬浮污泥区中"逃逸"的微小污泥絮体,并降低出水浊度,有效地保证了出水水质的稳定性。填料的存在发挥了强大的整流作用,降低了雷诺数Re,提高了弗汝德数Fr,从而改善了污泥絮凝的水力条件,提高了澄清能力。

The influence of media on the formation of the attached sludge in the solid-liquid separation of the novel clarifier was investigated. Experimental results indicated that duct streams could be formed around the more compact and stable attached sludge when the interface of sludge rose to the media section, which improved the floceulation effect. The minute flocculation escaped from the suspended sludge section could be trapped and removed by the media, which decreased turbidity and obtained a stable effluent quality. In conclusion, strong stability effect exists in the media section, which decreases Re and increases Fr. As a result, the flocculation of the sludge is improved and high effluent quality is achieved.